<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>练习5：DOM操作</title>
		<style type="text/css">
			html,div,ul,li {margin: 0px;padding: 0px;}
			a{cursor: pointer;}
			li {list-style: none;cursor: pointer;}
			fieldset {border: #000 1px dashed;width: 225px;height: 225px;padding: 10px;text-align: center;float: left;margin-left: 5px;}
			#cont_left {width: 300px;height: 500px;float: left;}
			#cont_right {float: left;}
			.newcss1{background-color: yellowgreen;}
		</style>
	</head>
	<body>
		<div id="cont_left">
			<ul><img src="img/fold.gif"><a onclick="show('menu1')"> 通过DOM获取信息 </a>
				<ul id="menu1">
					<li onclick="showImg()"><img src="img/doc.gif">获取原始图片路径</li>
					<li onclick="getFruit()"><img src="img/doc.gif">获取我喜欢的水果</li>
				</ul>
			</ul>

			<ul><img src="img/fold.gif"><a onclick="show('menu2')"> 通过DOM操作元素 </a>
				<ul id="menu2">
					<li onclick="createImg()"><img src="img/doc.gif">创建图片</li>
					<li onclick="cloneImg()"><img src="img/doc.gif">克隆图片</li>
					<li onclick="changeImg()"><img src="img/doc.gif">改变图片</li>
					<li onclick="removeImg()"><img src="img/doc.gif">删除图片</li>
				</ul>
			</ul>

			<ul><img src="img/fold.gif"><a onclick="show('menu3')"> 通过DOM操作样式 </a>
				<ul id="menu3">
					<li onclick="changeCss1()"><img src="img/doc.gif">为原始图片加上行间样式</li>
					<li onclick="changeCss2()"><img src="img/doc.gif">为所有的fieldset加上内部样式</li>
				</ul>
			</ul>

		</div>
		<fieldset>
			<legend>原始图片</legend>
			<img id="fruit" src="img/fruit.jpg">
		</fieldset>
		<fieldset>
			<legend>图片路径</legend>
			<p id="msg1">在这里显示</p>
		</fieldset>
		<fieldset>
			<legend>选择你喜欢的水果</legend>
			<ul style="text-align: left;">
				<li>
					<input name="enjoy" type="checkbox" value="苹果" />苹果
				</li>
				<li>
					<input name="enjoy" type="checkbox" value="香蕉" checked="checked" />香蕉
				</li>
				<li>
					<input name="enjoy" type="checkbox" value="葡萄" />葡萄
				</li>
				<li>
					<input name="enjoy" type="checkbox" value="梨" checked="checked" />梨
				</li>
				<li>
					<input name="enjoy" type="checkbox" value="西瓜" />西瓜
				</li>
			</ul>
			<div id="msg2" style="margin-top: 10px;text-align: left;"></div>
		</fieldset>
		<fieldset>
			<legend>创建图片</legend>
			<div id="msg3"></div>
		</fieldset>
		<fieldset>
			<legend>克隆图片</legend>
			<div id="msg4"></div>
		</fieldset>
		<script>
			//菜单收缩与扩展
			function show(title) {
				let currentMenu = document.getElementById(title);
				let currentStatus = currentMenu.style.display;
				currentMenu.style.display = currentStatus == "" ? "none" : "";
			}
			//获取原始图片路径
			function showImg() {
				var fruit = document.getElementById('fruit');
									var t1 = document.getElementById('msg1');
					                t1.innerHTML=fruit.getAttribute('src');
			}
			//获取喜欢的水果
			function getFruit() {
				var a = document.getElementsByName('enjoy'); //获取name是enjoy的元素				
									document.getElementById('msg2').innerHTML = "你最喜欢的水果是："; //获取需要输出地方的文本内容
									
									for(var i=0;i<=a.length;i++){
										if(a[i].checked == true){
											document.getElementById('msg2').innerHTML += a[i].value+" " ;
									}
									}
			}
			//创建图片
			function createImg() {
				var msg3 = document.getElementById('msg3'); //获取id元素
									var img1 = document.createElement('img'); //创建图片
									img1.src = "img/grape.jpg";   //选取想要创建的图片
									msg3.appendChild(img1); //图片挂载到id上
			}
			//克隆图片
			function cloneImg() {
				var msg4 = document.getElementById('msg4'); //获取id元素
									var cloneim = document.getElementById('fruit'); //获取图片id
									msg4.appendChild(cloneim.cloneNode());  //图片挂载到id上
			}
			//改变图片
			function changeImg() {
				var msg5 = document.getElementById('fruit'); //获取id元素
									msg5.src = "img/grape.jpg"; //更改src
			}
			//删除图片
			function removeImg() {
				var msg6 = document.getElementById('fruit'); //获取id元素
									msg6.parentNode.removeChild(msg6); //删除父节点
			}
			//操作样式1
			function changeCss1(){
				var ele = document.getElementById('fruit'); //获取id
									ele.style.border = 'solid 4px red';  //改变border样式
			}
			//操作样式2
			function changeCss2(){
				var ele = document.getElementsByTagName('fieldset');
									for(var i=0;i<ele.length;i++){
									ele[i].style.backgroundColor = "green";
								}
			}
		</script>
	</body>
</html>
